Device management using virtual interfaces

ABSTRACT

Management of data communication between a peripheral device and host computer system is provided. A physical interface for communicating data between a peripheral device and applications executing on the host is opened and controlled by a software module. First and second virtual interfaces of the software module are exposed to an operating system of the host, and the operating system exposes the first and second virtual interfaces to a first application and a second application executing on the host. The first virtual interface is used for communicating data between the peripheral device and the first application through the physical interface, and the second virtual interface is used for communicating data between the peripheral device and the second application through the physical interface. Management of data communication between the peripheral device and the first application and between the peripheral device and the second application is thereby provided.

FIELD OF THE INVENTION

The invention relates to data communication and more particularly to management of data communication between a host computer system and a peripheral device in communication with the host computer system.

BACKGROUND OF THE INVENTION

Many types of peripheral devices connect to a host computer system on which one or more applications execute. Those who manage deployment of peripheral devices, for instance a business entity that owns point-of-sale systems comprising host computer systems attached to barcode scanning peripheral devices, routinely face the need to manage their deployed peripheral devices. Peripheral devices connect to host computer system using a variety of wired and/or wireless communication interfaces. Some interface types, for instance those of the RS232 interface standard, have a limitation where only one RS232 interface can be exposed over the physical cable connection between the peripheral device and the host computer. This single interface is commonly owned by a Line of Business application on the host computer, which, in the example involving a barcode scanner peripheral device, typically performs data collection from the scanner. A problem arises when another utility or application on the host computer desires to manage the scanner over the existing interface. Such managing becomes challenging absent interference with normal scanner operation and performance expected by the Line of Business application. For instance, the Line of Business application would release the interface, freeing the interface so that another application, such as a management application, can assume exclusive use of the interface to communicate with the scanner, which can be impractical, problematic, and inefficient.

SUMMARY OF THE INVENTION

The shortcomings of the prior art are overcome and additional advantages are provided through a method of managing data communication, which method includes, for instance, opening and controlling, by a processor, a physical interface of a host computer system, the physical interface for communicating data between a peripheral device and a plurality of applications executing on the host computer system, the plurality of applications comprising a first application and a second application; exposing, in the host computer system, a first virtual interface and a second virtual interface to an operating system of the host computer system, wherein the operating system exposes the first virtual interface and the second virtual interface to the first application and the second application, the first virtual interface for communicating data between the peripheral device and the first application through the physical interface, and the second virtual interface for communicating data between the peripheral device and the second application through the physical interface; and managing data communication between the peripheral device and the first application, and between the peripheral device and the second application.

Additional features and advantages are realized through the concepts of the present invention. Other embodiments and aspects of the invention are described in detail herein and are considered a part of the claimed invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The features described herein can be better understood with reference to the drawings described below. The drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention. In the drawings, like numerals are used to indicate like parts throughout the various views.

FIG. 1 depicts one example of a host computer system in communication with a peripheral device, in accordance with one or more aspects of the present invention;

FIG. 2 depicts further details of a host computer system, in accordance with one or more aspects of the present invention;

FIG. 3 depicts one example of a process for managing data communication, in accordance with one or more aspects of the present invention;

FIG. 4 depicts one example of managing data communication between a peripheral device and host applications, in accordance with one or more aspects of the present invention; and

FIG. 5 depicts one embodiment of a computer program product to incorporate one or more aspects of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 depicts one example of a host computer system in communication with a peripheral device, in accordance with one or more aspects of the present invention. In FIG. 1, peripheral device 100 communicates with host computer system 110 across communications link 108. Communications link 108 can be any appropriate wired or wireless communication channel that supports analog or digital communication of data between peripheral device 100 and host 110. A non-limiting list of example communication links includes RS232 (such as a serial connection operating according to the RS232 standard), Universal Serial Bus, Wi-Fi™, and Bluetooth™ connections. In an embodiment where communications link 108 comprises a Universal Serial Bus communications link, peripheral device 100 can present itself to host computer system 110 as a Universal Serial Bus Serial device or a Universal Serial Bus Human Interface Device Barcode scanner.

By way of specific example, peripheral device 100 is an encoded information reading terminal comprising a processor 102 and one or more encoded information reading device 104. Encoded information reading device 104 can be provided, e.g. by a bar code reading device, an RFID reading device, and a card reading device. Encoded information reading device 104 can be operative to output one or more of a decoded message decoded from raw signal or a raw signal comprising an encoded message. Shown in the block view as being provided by a separate unit external to processor 102 processing functionality of encoded information device 104 can be provided by processor 102. In operation of peripheral device 100, image signals can be read out of encoded information reading device 104 and stored into a volatile or non-volatile memory (not pictured), such as random access memory, read only memory, or any other type of storage memory. Processor 102 can be adapted to perform various algorithms including reading out image data stored in memory and/or algorithms supporting communication of data across communications link 108 via one or more I/O component(s) 106.

Host 110 similarly includes I/O component(s) 112. I/O components include one or more physical interfaces for communicating data to/from peripheral device 100. These interfaces comprise one or more hardware components. In the example of an RS232 communications link, a supporting physical interface comprises a hardware serial port, as an example.

Host 110 also includes processor 114 and memory 116. Memory 116 can include one or more volatile or non-volatile memories of one or more types, such as random access memory, read only memory, or any other type of storage memory, such as a hard disk drive. Further details of host 110 are described with reference to FIG. 2.

FIG. 2 depicts further details of a host computer system in accordance with one or more aspects of the present invention. In FIG. 2, host 210 includes physical interface 212, processor 214, and memory 216. As is understood by those having ordinary skill in the art, a processor can be configured to execute instructions of a program. Common such programs are an operating system and applications which run on the operating system. In FIG. 2, processor 214 executes operating system 218 and applications 220 a and 220 b. Application 220 a comprises a line of business application. A line of business (LOB), in general, is a group of one or more related applications or modules which service a business need. In the context of host-peripheral device communication, a line of business application may be responsible for sending data to and/or receiving data from a peripheral device. In the specific example of a barcode scanner, the line of business application can execute on the host machine and accept from the peripheral device decoded data which is read-out from an encoded image (such as a barcode) using the peripheral device.

Application 220 b in FIG. 2 comprises a management application. Management application 220 b supports device management of a peripheral device, such as peripheral device 100 of FIG. 1. Examples of device management include performance of a firmware upgrade of the firmware of the peripheral device, and performance of a reconfiguration of the peripheral device, such as a reconfiguration to adjust one or more operating parameters of the peripheral device.

Aspects of the current invention define a software module for a host computer. The software module opens and owns a physical interface, such as an RS232 I/O port, to which a peripheral device is attached. It also exposes multiple virtual interfaces, such as virtual RS232 interfaces, to the operating system of the host.

The software module can manage data communication between the peripheral device and one or more applications executing on the host computer system by properly routing data coming from the peripheral device to the one or more applications of the host, or data going from the one or more applications of the host to the peripheral device. This facilitates communication between a line of business application and the peripheral device without the line of business application being aware that the physical interface is being shared with other applications, such as a management tool, behind the scenes.

Filtering program code 230 of FIG. 2 is an example software module. Filtering program code 230 opens and controls physical interface 212, which is a physical interface through which host 210 communicates with a peripheral device, such as a barcode scanner. Filtering program code 230 exposes a first virtual interface 232 a and a second virtual interface 232 b to operating system 218. While filter program code 230 exposes two virtual interfaces in the example of FIG. 2, it should be understood that filtering program code 230 could expose any desirable number of virtual interfaces depending on the particular scenario, for instance the number of applications on the host that will communicate with the peripheral device. By exposing virtual interfaces 232 a, 232 b to operating system 218, operating system 218 can then make these interfaces available to applications executing on operating system 218. This allows each application to be configured to use a respective one of the virtual interfaces 232 a, 232 b to send and receive data communication. In FIG. 2, operating system 218 exposes virtual interfaces 232 a, 232 b to line of business application 220 a and management application 220 b. Then, line of business application 220 a can be configured (for instance, manually by a user or automatically) to use virtual interface 232 a for communicating data between the peripheral device and line of business application 220 a, while management application 220 b can be configured (for instance, manually by a user or automatically) to use virtual interface 232 b for communicating data between the peripheral device and management application 220 b.

Filter program code 230 effectively allows performing device management by management application 220 b in parallel with a data collection processes whereby data is communicated to a separate line of business application (e.g. 220 a ), without affecting the performance or expected operation for a user and line of business application 220 a. In a further enhancement, filter program code 230 can also support configuration requests to change its behavior (timeouts, filtering logic described below). In this manner, the code can be reconfigured to, for instance, make the filtering logic be based on a different pattern(s), or change a maximum timeout for the code to remain in a transaction mode giving the management application exclusive access to the device. An example of such a configuration request is a Windows Input/Output Control (IOCTL) call/request, when filter program code 230 comprises a Microsoft® Windows® based driver.

In one example, filter program code 230 comprises a device driver, such as a filter driver for the Windows® operating system offered by Microsoft Corporation. The software can be a driver such as a “driver service” which is a kernel-level filter driver implemented as a Windows® service.

The driver installation can be made non-intrusive with no dialog prompts and no security warnings for the user. The actual driver can internally be comprised of multiple drivers, depending on the operating system requirements. The driver can be written as a kernel-level driver for a kernel of operating system 218, whereby the driver exposes the two or more (depending on the number of applications to support) virtual interfaces in the operating system. Additionally, an installation tool can allow a user to preselect what the desired virtual interface (port) numbers should be.

Continuing with FIG. 2, filter program code 230 can use one or more filter logic rules 234 defining filtering rules for filtering data received from a peripheral device to an appropriate application to which the data directed. Filter logic rules 234 are depicted as being optionally hard-coded into filter program code 230, or in a separate module in memory 216 external to filter program code 230. In the later example, filter logic rules 234 can comprise one or more scripts in a text file stored in memory 216. By maintaining externally loaded filter logic rules, external to filter program code 230, the rules can be easily updated without having to recompile the filter program code. This is especially useful in the case where filter program code comprises a driver, because of the security, stability, and compatibility sensitivities involved in modifying device drivers of an operating system. Alternatively or additionally, filter logic rules 234 can be maintained within filtering program code 230, if so desired.

Filter logic rules can be in any format recognizable to the software module (e.g. filter program code) to enable it to properly filter data communications to the appropriate destination. In this respect, the rules can describe one or more of:

-   -   The format of the incoming data from the peripheral device, and         more particularly the format of data intended for particular         application(s) (for instance data intended for only the line of         business application, for only the management application, or         for both the line or business application and the management         application) so that the software module can recognize and         route/filter this incoming data to the proper application(s)     -   How to handle custom events/procedures, such as (i) the         shielding of the virtual interface used by the line of business         application from a peripheral device reboot event, such as a         reboot event triggered by the management application,         and/or (ii) the freezing of some or all data communication         from/to the virtual interface used by the line of business         application while the management application performs a         reconfiguration or firmware upgrade of the peripheral device         (i.e.: freeze timeout for a “transaction mode”). In this regard,         when the management application communicates with the peripheral         device, this may cause the line of business application to         detect configuration changes or events, and this may be         undesirable. To prevent this, in the former scenario         (shielding), the software module can “shield” the line of         business application from a peripheral device reboot event so         that the application's connection handle, which is owned by the         line of business application and represents the communication         path to the virtual interface exposed to the line of business         application by the software module, is preserved. This         effectively prevents, by the software module, the reboot event         (in the form of data communication received from the peripheral         device to the host) from permeating through to the line of         business application. In the later scenario (freezing for         transaction mode), data received from/to the virtual interface         used by the line of business application while that interface is         frozen may be queued until the freeze timeout expires. The idea         is that if the management application requests operation in a         transaction mode, it will have exclusive access to the device,         until it has completed the tasks it needs. It can be seen as an         atomic operation, where the management application temporarily         overtakes the peripheral device from the line of business         application to perform some task(s). When done, access to the         device is restored to the line of business application, all         while keeping the line of business application unaware of the         interruption.     -   How to handle simultaneous virtual interface requests, such as         simultaneous requests to the virtual interfaces made by the line         of business application and the management application. The         filter logic rules can indicate which virtual interface receives         data communication routing preference and how that preference is         carried out by the software module so as to not affect         performance of the line of business application.

As noted, filter logic rules are employed in facilitating management of data communication. FIG. 3 depicts one example of a process for managing data communication, in accordance with one or more aspects of the present invention. In one example, this process is performed by way of a software module executing on a processor, such as a processor of a host computer system. The process begins by the software module opening the host physical interface (302). In one example, software module comprises a driver that opens and ‘owns’ the physical interface. Next, multiple virtual interfaces are exposed to the host operating system (304). As described above, some physical interfaces, such as RS232 interface supports only one interface to be exposed over the physical connection (cable) between the host computer and the peripheral device. The multiple virtual interfaces become the interfaces through which multiple applications may communicate across the (single) physical interface with a peripheral device connected to the host computer system. After the host applications are configured to use the appropriate virtual interface (described below), management of data communication between the peripheral device and host applications (306) is enabled, and the process ends.

Management of data communication between a peripheral device and host applications is described and depicted in further detail with reference to FIG. 4, depicting an example process thereof, in accordance with one or more aspects of the present invention. The process begins with the identification of one or more appropriate applications to which received data is to be communicated (402). In one example, this is initiated responsive to receipt by the software module of data from the peripheral device. In one example, the identification is facilitated by examining the data, such as a packet header of a data packet, to determine (based on the filter logic rules) one or more appropriate applications to which the data is to be filtered/routed. It should be noted that it may be desirable to provide some data (e.g. barcode data, image data, device operation statistics) to more than one application. Next, the process identifies one or more appropriate virtual interfaces through which the received data is to be provided (404). In accordance with an aspect of the present invention, each virtual interface will exist to service data communication with a different type of application, and each application to which the peripheral device sends data will be configured to use the virtual interface of the multiple exposed virtual interfaces which is dedicated exclusively to servicing data communication with that type application. The software module can be aware of which virtual interface services which type of application of the multiple applications. Thus, in the example in which a line of business application and a management application execute on a host computer system, a first virtual interface of the virtual interfaces will be dedicated to the line of business application, and a second virtual interface of the virtual interfaces will be dedicated to the management application. Identification of the one or more appropriate virtual interfaces through which the data is to be provided to the appropriate applications (404) is based on the identified application(s) that are to receive the data communication—for instance, if the examination of the data and comparison to the filter logic rules indicates that the data is to be provided only to the line of business application, then the appropriate virtual interface (i.e. that dedicated to the line of business application) is identified. Following this, the data is provided to the appropriate application(s) through the appropriate interface(s) (406).

In conjunction with the logic of the software module, the peripheral device identifies the type of data that it is sending to the host. In one example, data is ‘wrapped’ in one or more packets having a format recognizable by the software module. This format can be the format described in one or more filter logic rules on the host computer, to facilitate identification by the host of the proper application executing thereon to which the data is to be provided. For instance, the peripheral device can identify that data being sent to the host is data intended for the line of business application. Identification of the type of data wrapped in a packet and/or the application to which the data is intended can be provided through one or more indicators (e.g. bits) in the data packet, and, in one example, in a header of the data packet. In the context of FIG. 2, such identification enables the peripheral device to send unsolicited notifications, such as decoding statistics and diagnostics events, to a management application, which unsolicited notifications are not intended for the line of business application.

Advantageously, aspects of the present invention can enable the management of data communications as described above without the need to modify and/or recompile the applications executing on the host. Instead, the applications need only be configured to use the appropriate virtual interface dedicated to data communication for that particular application, rather than to use the physical interface. In many instances, the appropriate interface for the application to use is provided by a single configuration setting in the application which enables the selection of an interface from a list of interfaces presented by the operating system to the application. The single configuration setting would be simply to point the application to the appropriate virtual interface rather than the physical interface.

Aspects of the present invention can be applied to any type of interface used by a peripheral device. The software module in the host can simply virtualize the original physical interface and expose two (or more) new virtual interfaces as described above. Thus, aspects of the present invention are applicable for Universal Serial Bus physical interfaces, as well as many other physical interfaces as will be appreciated by those having ordinary skill in the art.

As will be appreciated by one skilled in the art, aspects of the present invention may be embodied as a system, method or computer program product. Accordingly, aspects of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, micro-code, etc.) or an embodiment combining software and hardware aspects that may all generally be referred to herein as a “circuit,” “module” or “system.” Furthermore, aspects of the present invention may take the form of a computer program product embodied in one or more computer readable medium(s) having computer readable program code embodied thereon.

Any combination of one or more computer readable medium(s) may be utilized. The computer readable medium may be a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the “C” programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).

Referring now to FIG. 5, in one example, a computer program product 500 includes, for instance, one or more computer readable media 502 to store computer readable program code means or logic 504 thereon to provide and facilitate one or more aspects of the present invention.

Aspects of the present invention are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer readable medium that can direct a computer, other programmable data processing apparatus, or other devices to function in a particular manner, such that the instructions stored in the computer readable medium produce an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.

The computer program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.

The flowchart and block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Further, a data processing system suitable for storing and/or executing program code is usable that includes at least one processor coupled directly or indirectly to memory elements through a system bus. The memory elements include, for instance, local memory employed during actual execution of the program code, bulk storage, and cache memory which provide temporary storage of at least some program code in order to reduce the number of times code must be retrieved from bulk storage during execution.

Input/Output or I/O devices (including, but not limited to, keyboards, displays, pointing devices, DASD, tape, CDs, DVDs, thumb drives and other memory media, etc.) can be coupled to the system either directly or through intervening I/O controllers. Network adapters may also be coupled to the system to enable the data processing system to become coupled to other data processing systems or remote printers or storage devices through intervening private or public networks. Modems, cable modems, and Ethernet cards are just a few of the available types of network adapters.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising”, when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.

The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the claims below, if any, are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. The description of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the invention. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

A small sample of methods that are described herein is as follows:

-   A1. A method of managing data communication, the method comprising:     opening and controlling, by a processor, a physical interface of a     host computer system, the physical interface for communicating data     between a peripheral device and a plurality of applications     executing on the host computer system, the plurality of applications     comprising a first application and a second application; exposing,     in the host computer system, a first virtual interface and a second     virtual interface to an operating system of the host computer     system, wherein the operating system exposes the first virtual     interface and the second virtual interface to the first application     and the second application, the first virtual interface for     communicating data between the peripheral device and the first     application through the physical interface, and the second virtual     interface for communicating data between the peripheral device and     the second application through the physical interface; and managing     data communication between the peripheral device and the first     application, and between the peripheral device and the second     application. -   A2. The method of A1, wherein the peripheral device comprises an     encoded information reading terminal comprising an encoded     information reading device configured to output a decoded message,     wherein the first application comprises a line of business     application for receiving the decoded message from the encoded     information reading terminal, and wherein the second application     comprises a management application for managing the encoded     information reading terminal. -   A3. The method of A1, wherein the managing data communication     between the peripheral device and the first application and between     the peripheral device and the second application comprises filtering     data received from the peripheral device through the physical     interface to the first application and the second application, the     filtering comprising: identifying one or more appropriate     applications of the first application and the second application to     which the received data is to be provided; identifying one or more     appropriate virtual interfaces of the first virtual interface and     the second virtual interface through which the received data is to     be provided; and providing the received data through the appropriate     one or more virtual interfaces to the appropriate one or more     applications, wherein received data is provided to the first     application through the first virtual interface and wherein received     data is provided to the second application through the second     virtual interface. -   A4. The method of A3, wherein one or more filter logic rules define     one or more rules for filtering received data to one or more     appropriate applications of the first application and the second     application. -   A5. The method of A4, wherein the one or more filter logic rules     describe a format of incoming data from the peripheral device to     distinguish between data intended for different applications of the     first application and the second application. -   A6. The method of A5, wherein the received data is provided by the     peripheral device through the physical interface in the described     format to facilitate identifying the one or more appropriate     applications to which the received data is to be provided, and     wherein the identifying identifies the one or more appropriate     applications based on the description of the format provided by the     one or more filter logic rules. -   A7. The method of A4, wherein the first application comprises a line     of business application, wherein the second application comprises a     management application, wherein a filter logic rule of the one or     more filter logic rules defines how a peripheral device reboot event     is to be handled to shield the line of business application from the     reboot event in order to facilitate preservation of a connection     handle of the line of business application to the peripheral device,     and wherein another filter logic rule of the one or more filter     logic rules identifies how to freeze data communication to or from     the line of business application during performance of peripheral     device management by the management application. -   A8. The method of A4, wherein the received data comprises     simultaneous requests for the first application and for the second     application, and wherein at least one filter logic rule of the one     or more filter logic rules identifies how the host computer system     is to handle the simultaneous requests. -   A9. The method of A3, wherein the filtering is performed by a filter     driver of the operating system, and wherein one or more filter logic     rules are maintained in a filter logic rules file external to the     filter driver to facilitate updating the filter logic rules     separately from the filter driver absent a need to recompile the     filter driver upon updating the filter logic rules. -   A10. The method of A9, wherein the filter driver supports     configuration requests to change behavior of the filter driver in     performing the filtering. -   A11. The method of A9, wherein the filter driver comprises a     kernel-level driver of a kernel of the operating system, the     kernel-level driver for exposing the first virtual interface and the     second virtual interface to the operations system. -   A12. The method of A1, wherein a driver of the operating system     opens and owns the physical interface and exposes the first virtual     interface and the second virtual interface to the operating system,     and wherein the first application is configured to utilize the first     virtual interface for data communication with the peripheral device,     and wherein the second application is configured to utilize the     second virtual interface for data communication with the peripheral     device. -   A13. The method of A1, wherein the physical interface comprises an     RS232 interface supporting only a single interface connection     between the RS232 interface and the peripheral device. -   A14. The method of A1, wherein the peripheral device comprises an     encoded information reading device configured to output a decoded     message, wherein data communicated between the peripheral device and     the host computer system comprises the decoded message and wherein     the decoded message is communicated to a line of business     application of the multiple applications executing on the host     computer system.

While the present invention has been described with reference to a number of specific embodiments, it will be understood that the true spirit and scope of the invention should be determined only with respect to claims that can be supported by the present specification. Further, while in numerous cases herein wherein systems and apparatuses and methods are described as having a certain number of elements it will be understood that such systems, apparatuses and methods can be practiced with fewer than or greater than the mentioned certain number of elements. Also, while a number of particular embodiments have been described, it will be understood that features and aspects that have been described with reference to each particular embodiment can be used with each remaining particularly described embodiment. 

What is claimed is:
 1. A method of managing data communication, the method comprising: opening and controlling, by a processor, a physical interface of a host computer system, the physical interface for communicating data between a peripheral device and a plurality of applications executing on the host computer system, the plurality of applications comprising a first application and a second application; exposing, in the host computer system, a first virtual interface and a second virtual interface to an operating system of the host computer system, wherein the operating system exposes the first virtual interface and the second virtual interface to the first application and the second application, the first virtual interface for communicating data between the peripheral device and the first application through the physical interface, and the second virtual interface for communicating data between the peripheral device and the second application through the physical interface; and managing data communication between the peripheral device and the first application, and between the peripheral device and the second application.
 2. The method of claim 1, wherein the peripheral device comprises an encoded information reading terminal comprising an encoded information reading device configured to output a decoded message, wherein the first application comprises a line of business application for receiving the decoded message from the encoded information reading terminal, and wherein the second application comprises a management application for managing the encoded information reading terminal.
 3. The method of claim 1, wherein the managing data communication between the peripheral device and the first application and between the peripheral device and the second application comprises filtering data received from the peripheral device through the physical interface to the first application and the second application, the filtering comprising: identifying one or more appropriate applications of the first application and the second application to which the received data is to be provided; identifying one or more appropriate virtual interfaces of the first virtual interface and the second virtual interface through which the received data is to be provided; and providing the received data through the appropriate one or more virtual interfaces to the appropriate one or more applications, wherein received data is provided to the first application through the first virtual interface and wherein received data is provided to the second application through the second virtual interface.
 4. The method of claim 3, wherein one or more filter logic rules define one or more rules for filtering received data to one or more appropriate applications of the first application and the second application.
 5. The method of claim 4, wherein the one or more filter logic rules describe a format of incoming data from the peripheral device to distinguish between data intended for different applications of the first application and the second application.
 6. The method of claim 5, wherein the received data is provided by the peripheral device through the physical interface in the described format to facilitate identifying the one or more appropriate applications to which the received data is to be provided, and wherein the identifying identifies the one or more appropriate applications based on the description of the format provided by the one or more filter logic rules.
 7. The method of claim 4, wherein the first application comprises a line of business application, wherein the second application comprises a management application, wherein a filter logic rule of the one or more filter logic rules defines how a peripheral device reboot event is to be handled to shield the line of business application from the reboot event in order to facilitate preservation of a connection handle of the line of business application to the peripheral device, and wherein another filter logic rule of the one or more filter logic rules identifies how to freeze data communication to or from the line of business application during performance of peripheral device management by the management application.
 8. The method of claim 4, wherein the received data comprises simultaneous requests for the first application and for the second application, and wherein at least one filter logic rule of the one or more filter logic rules identifies how the host computer system is to handle the simultaneous requests.
 9. The method of claim 3, wherein the filtering is performed by a filter driver of the operating system, and wherein one or more filter logic rules are maintained in a filter logic rules file external to the filter driver to facilitate updating the filter logic rules separately from the filter driver absent a need to recompile the filter driver upon updating the filter logic rules.
 10. The method of claim 9, wherein the filter driver supports configuration requests to change behavior of the filter driver in performing the filtering.
 11. The method of claim 9, wherein the filter driver comprises a kernel-level driver of a kernel of the operating system, the kernel-level driver for exposing the first virtual interface and the second virtual interface to the operations system.
 12. The method of claim 1, wherein a driver of the operating system opens and owns the physical interface and exposes the first virtual interface and the second virtual interface to the operating system, and wherein the first application is configured to utilize the first virtual interface for data communication with the peripheral device, and wherein the second application is configured to utilize the second virtual interface for data communication with the peripheral device.
 13. The method of claim 1, wherein the physical interface comprises an RS232 interface supporting only a single interface connection between the RS232 interface and the peripheral device.
 14. The method of claim 1, wherein the peripheral device comprises an encoded information reading device configured to output a decoded message, wherein data communicated between the peripheral device and the host computer system comprises the decoded message and wherein the decoded message is communicated to a line of business application of the multiple applications executing on the host computer system. 